Fix: avoid HAVING clause conflicts in custom field query filter on MariaDB (#13143)

src/documents/tests/test_api_filter_by_custom_fields.py

@@ -138,7 +138,7 @@ class TestCustomFieldsSearch(DirectoriesMixin, APITestCase):
         title = str(kwargs)
         document = Document.objects.create(
             title=title,
-            checksum=title,
+            checksum=title[:64],
             archive_serial_number=len(self.documents) + 1,
         )
         data = {